Update README.md

README.md

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 ## What's next?
-* The next lab can be founds [here](https://github.com/Zipcoder/ZCW-MicroLabs-JavaFundamentals-TooLargeTooSmall).
+* The next lab can be founds [here](https://github.com/Zipcoder/ZCW-MicroLabs-JavaFundamentals-SumOfInput).